The official National Weather Service forecast for Clemmons — 36.0215°N, 80.382°W, 2.1 miles from I-40. Forecasts here are written by NWS RAH, this county’s forecast office.
| Forsyth County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 49 | 54 | 62 | 71 | 78 | 85 | 88 | 86 | 80 | 71 | 61 | 52 | 70 |
| Avg low °F | 28 | 32 | 38 | 46 | 55 | 63 | 67 | 66 | 60 | 47 | 37 | 32 | 48 |
| Precip in | 3.5 | 3.2 | 3.5 | 3.9 | 4.2 | 3.8 | 4.4 | 4.4 | 4.4 | 3.0 | 3.0 | 3.6 | 44.9 |
1996–2025 normals for Forsyth County — the climate division Clemmons sits in. All-time county record high 102.5°F (1952-07-29); record low -8.3°F (1985-01-21). Source: NOAA / National Weather Service.